首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Putting Plants to Work Using the power of the sun is nothing new. People have had solar-powered calculators and buildings wi
Putting Plants to Work Using the power of the sun is nothing new. People have had solar-powered calculators and buildings wi
admin
2014-02-28
98
问题
Putting Plants to Work
Using the power of the sun is nothing new. People have had solar-powered calculators and buildings with solar panels(太阳能电池板)for decades. But plants are the real experts. They’ve been using sunlight as an energy source for billions of years.
Cells in the green leaves of plants work like tiny factories to convert sunlight, carbon dioxide(二氧化碳), and water into sugars and starches(淀粉), stored energy that the plants can use. This conversion process is called photosynthesis(光合作用). Unfortunately, unless you’re a plant, it’s difficult and expensive to convert sunlight into storable energy. That’s why scientists are taking a closer look at exactly how plants do it.
Some scientists are trying to get plants, or biological cells that act like plants, to work as very small photosynthesis power stations. For example, Maria Ghirardi of the National Renewable Energy Laboratory in Golden. Colo., is working with green algae(水藻). She’s trying to trick them into producing hydrogen instead of sugars when they perform photosynthesis. Once the researchers can get the algae working efficiently, the hydrogen that they produce could be used to power fuel cells in cars or to generate electricity.
The algae are grown in narrow-necked glass bottles to produce hydrogen in the lab. During photosynthesis, plants normally make sugars or starches." But under certain conditions, a lot of algae are able to use the sunlight energy not to store starch, but to make hydrogen." Ghirardi says. For example, algae will produce hydrogen in an airfree environment. It’s the oxygen in the air that prevents algae from making hydrogen most of the time.
Working in an airfree environment, however, is difficult. It’s not a practical way to produce cheap energy. But Ghirardi and her colleagues have discovered that by removing a chemical called sulfate(硫酸盐)from the environment that the algae grow in, they will make hydrogen instead of sugars, even when air is present.
Unfortunately, removing the sulfate also makes the algae’s cells work very slowly, and not much hydrogen is produced. Still, the researchers see this as a first step in their goal to produce hydrogen efficiently from algae. With more work, they may be able to speed the cells’ activity and produce larger quantities of hydrogen.
The researchers hope that algae will one day be an easy-to-use fuel source. The organisms are cheap to get and to feed, Ghirardi says, and they can grow almost anywhere: "You can grow them in a reactor, in a pond. You can grow them in the ocean. There’s a lot of flexibility in how you can use these organisms."
How do plants relate to solar energy ?
选项
A、They have been using it for billions of years.
B、They are the real experts in producing it.
C、They have been a source of it.
D、They have been used to produce it.
答案
A
解析
根据文章第一段最后一句话“They’ve been using sunlight as an energy source for billions ofyears.”可知,数十亿年以来,植物一直利用太阳光作为能量来源。
转载请注明原文地址:https://kaotiyun.com/show/JpQd777K
本试题收录于:
职称英语理工类B级题库职称英语分类
0
职称英语理工类B级
职称英语
相关试题推荐
ABiologicalClockEverylivingthinghaswhatscientistscallabiologicalclockthatcontrolsbehavior.Thebiologicalclo
LightNight,DarkStarsThousandsofpeoplearoundtheglobestepoutsidetogazeattheirnightsky.Onaclearnight,with
MedicineAwardKicksoffNobelPrizeAnnouncementsTwoscientistswhohavewonpraiseforresearchintothegrowthofcancer
NeedforEmphasisonTreatmentAIDSprogramsindevelopingcountriesputtoolittleemphasisontreatment,theWorldHealth
HowTwoGreatConflictsHelpedtoChangeEuropeNinetyyearsagoonasunnymorninginNorthernFrance,somethinghappenedt
ScientistsDevelopWaysofDetectingHeartAttackGermanresearchershave(1)anewgenerationofdefibrillatorsandearlywarn
A.ColorfulLifeonCampusB.IntelligentStudentBodyC.ExcellentAdministrationD.DistinguishedFacultyE.SubstantialFinancial
Icebergs1Icebergsareamongnature’smostspectacular(壮观的)creations,andyetmostpeoplehaveneverseenone.Avagueairo
Icebergs1Icebergsareamongnature’smostspectacular(壮观的)creations,andyetmostpeoplehaveneverseenone.Avagueairo
HenryManleywasalreadydeeplyindebt.GeorgeStrongwasthebestengineerinHenryManley’scompany.
随机试题
使能者是社会工作者所承担的一个重要服务角色,下列对“使能”的理解正确的是()。
A.影响胞浆膜的通透性B.抑制核酸代谢C.抗叶酸代谢D.抑制蛋白质合成E.抑制细菌细胞壁合成甲氧苄啶的抗菌机制是
有机磷中毒时,代谢失常的神经递质是
在研究与开发方式中,()的优点是风险小、见效快,在实施过程中,企业的研发能力有一定提高。
《民法通则》第一百二十七条规定,饲养的动物造成他人损害是由于受害人的过错造成的,饲养人或管理人()。
人们获得的信息在头脑中是按照某种方式组织的,遗忘的原因往往是检索困难造成的。因此,要增进记忆效果应在学习时采用()的方法。
下列各选项,说法有误的是()。
幕府政治
设函数f(x)=1/(ex/(x-1)-1),则
A、Theydon’thavetodroptheirnativeaccent.B、Theirmindsandbodiesaremuchmoreflexible.C、Theyusuallytakepronunciatio
最新回复
(
0
)